This is a PFERD Horse 100 EHT 350-4 A 24 SG cutting wheel, part of their high-performance SG-ELASTIC product line. A 24 SG: Specifies the abrasive type (A for Aluminum Oxide), grit size (24), and performance line (SG – Performance Line).
TOPBRAS ABRASIVOS VINHEDO Abrasivos de Alta Performance Experiência, Competência e Qualidade